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1. Distinguish between simple random, stratified random, and cluster sampling.
2. Why don't researchers who want to test hypotheses about the relationships between variables worry a great deal about random sampling?
What is the probability that the police will strike and the firefighters will not? What is the probability that the firefighters will strike and the police will not?
They wish to conduct a survey of their students and find a simple random sample of 50 Freshmen, 40 Sophomores, 35 Juniors, and 30 Seniors.
messages arrive to a computer server according to a poisson distribution with a mean rate of 10 per hour. determine the
Coke cans: n=36, mean of values in sample = 12.19 oz., s= 0.11 oz. Test the claim that the mean equals 12 oz. Use a significance level of alpha = 0.02.
in a suburban area past records revealed that 50 percent of all the high school graduates go to college. from 20
Explain the difference between a discrete and a continuous random variable. Give two examples of each type of random variable.
The world record time (in minutes) in the marathon is plotted versus the year in which the record was set for men and women separately. The plotting symbol o is used for men and x for women. The data include only records set between 1908 and 1988.
You are required to submit the FINAL copy of this assignment, but you may first submit an optional DRAFT. This will allow you to receive qualitative feedback that can inform your revision.
You have found a 3.0 TB drive for $300. Is this a good buy? How much would you save compared to what you expected to pay? Does the model overestimate or underestimate the price?
Estimate with 95% confidence the mean reduction in time it takes for someone who has taken the sleeping pill to fall asleep.
Consider the following joint probability distribution for uncertain quantities X and Y:
A company wants to determine if employees have any preferences among 5 different health plans. A sample of 200 employees provided the data below.
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